comparative study of r134a and r744 driven solar

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comparative study of r134a and r744 driven solar

Recent Advances in Transcritical CO2 (R744) Heat Pump ...

Li, S.; Li, S.; Zhang, X. Simulation research of a hybrid heat source heat pump using R134a, R744 instead of R22 for domestic water heating in residential buildings. Energy Build. 2015, 91, 57–64. [Google Scholar] Cho, H. Comparative study on the performance and exergy efficiency of a solar hybrid heat pump using R22 and R744.

Comparative study on the performance and exergy efficiency ...

Dec 15, 2015· Specifically, the solar-hybrid heat pump system is a very safe system using the environment-friendly and harmless refrigerant R744. In this study, the analyses of the performances and exergy losses of the R22 and R744 solar-hybrid heat pump systems were carried out using experimental tests during a sunny and a cloudy day.

The substitution of R134a with R744: An exergetic analysis ...

Dec 01, 2013· A comparison is performed between R134a and R744 (CO 2). R134a is a hydrofluorocarbon with a large direct warming impact (GWP), whereas the R744 contribution is negligible. A comparative exergetic analysis, carried out with experimental tests, has been presented.

Comparative Thermodynamic Study of Refrigerants to …

Jul 12, 2018· In this study, a solar ejector cooling system is theoretically analyzed to evaluate refrigerants and determine their performance characteristics and environment-friendly nature for a fixed ejector geometry under a set of standard operating conditions. The results show that the refrigerant R1234yf is the best choice for the cycle, and is an environment-friendly refrigerant with thermo …

Comparative study on the performance and exergy efficiency ...

Dec 15, 2015· Specifically, the solar-hybrid heat pump system is a very safe system using the environment-friendly and harmless refrigerant R744. In this study, the analyses of the performances and exergy losses of the R22 and R744 solar-hybrid heat pump systems were carried out using experimental tests during a sunny and a cloudy day.

Review of ejector design parameters and geometry for ...

May 19, 2015· Computer Applications in Environmental Sciences and Renewable EnergyReview of ejector design parameters and geometry for refrigeration and air conditioning application B.ELHUB,MOHAMED AZLY ABDUL AZIZ, MOHD KHAIRUL ANUAR BIN SHRIF SOHIF MAT, Solar energy research institute (SERI) UniversitiKebangsaan Malaysia UKM 43600 UKM, Bangi Selangor, …

Performance Comparison of a Truck Refrigeration System ...

This study predicts cooling performance by using an analytical model, for refrigeration systems using R404A and R134a. Furthermore, the performances of those systems were compared with those of alternative refrigeration systems using R1234yf and R744.

(PDF) Comparative investigation on the exergoeconomic ...

In this article, the economic performance of the solar-driven steam ejector refrigeration system is addressed due to the rising beneficial adoption of this system with regard to using low-grade heat sources. For this purpose, a detailed

Comparative investigation and multi objective design ...

Jul 28, 2018· This study aims to make a comparative investigation on performance analysis of cascade refrigeration systems using R744/R717, R744/R134a, and R744/R1234yf refrigerant pairs.

Comparative study of R134a and R744 driven solar …

Comparative study of R134a and R744 driven solar assisted heat pump systems for different applications . ... Abstract. A solar assisted heat pump (SAHP) system is considered in this study where space cooling, water heating, drying and desalination are carried out using solar energy, ambient energy and the waste heat available from air ...

R717 and R744 vapour compressor heat pumps have best ...

Oct 07, 2014· At the 2014 Gustav Lorentzen conference in Hangzhou, China, a comparative study was presented examining the applicability of five single stage vapour compression heat pumps (VCHP) using the refrigerants R134a, R290, R717LP, R717HP and R744. The study considers operational and economic constraints such as refrigeration equipment availability and positive Net Present Value of …

Low GWP Refrigerants for Energy Conservation and ...

Nov 02, 2018· Kojima H, Arakaki S, Fukuda S, Takata N, Kondou C, Koyama S (2016) comparative study on heat pump cycle using R32/R1234yf and R744/R32/R1234yf. 8th Asian Conf Refrig Air Cond 8–11. Taiwan Google Scholar

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Natural refrigerants – CO2-based air conditioning system ...

R744 is at least 1,300 times less harmful to the cli-mate than the fluorinated greenhouse gas R134a. Carbon dioxide has a number of advantages as a refrigerant. It has a high cooling capacity, it is non-combustible, and available worldwide at low cost in the required qualities. Innovative plant technology using R744 is ready for serial produc ...

Low GWP Refrigerants for Energy Conservation and ...

Nov 02, 2018· Kojima H, Arakaki S, Fukuda S, Takata N, Kondou C, Koyama S (2016) comparative study on heat pump cycle using R32/R1234yf and R744/R32/R1234yf. 8th Asian Conf Refrig Air Cond 8–11. Taiwan Google Scholar

Solar Assisted Organic Rankine Cycle for Power Generation ...

Jun 15, 2016· In this study, a comparative thermodynamic analysis of a solar assisted organic Rankine cycle (ORC) is carried out for different natural working fluids. The required heat energy demand for ORC is supplied by solar energy by means of parabolic trough solar collectors (PTSCs).

Thermodynamic Assessment of Using Water as a Refrigerant ...

May 19, 2021· Comparative Study of a Cascade Cycle for Simultaneous Refrigeration and Heating ... Energy Assessment and Environmental Impact Analysis of an R134a/R744 Cascade Refrigeration Plant Upgraded With the Low-GWP Refrigerants R152a, R1234ze(E), Propane (R290) and Propylene (R1270) ... Energy and Exergy Performance Comparative Analysis of Solar Driven ...

A comprehensive comparative investigation on solar …

Dec 22, 2020· These systems can be driven by either photovoltaic (PV) modules or solar-driven power cycles (usually an organic Rankine cycle [ORC]). 5 A comprehensive review on thermally and electrically driven cooling technologies was reported in Sleiti et al 6 A VCC driven by PV (denoted PV-VCC) is the most common solar electrically driven cooling ...

REVIEW OF CASCADE REFRIGERATION SYSTEM WITH …

Nov 26, 2018· A Comparative assessment of a cascade refrigeration cycle with different refrigerant pair is presented in this paper. R744 is used in Low-temper ature (LT) cycle whereas R134a,R290,R717 and R404A (R125 (44%)/R143a (52%) /R134a (4%)) are use d in the High-temperature (HT) cycle. The effects of the thermodynamic parameters on the cascade system ...

Evaluation of Minimum, Maximum and Optimum Source ...

Sep 03, 2020· Due to the utilization of solar thermal energy and environmentally friendly nature, globally there is a huge thrust toward the development of vapor adsorption refrigeration systems. Indeed, it is necessary to identify the minimum, maximum and optimum temperatures of heat source for solar-powered adsorption systems. With this objective, the presented paper focuses on the evaluation of …

Comparative study of R134a and R744 driven solar assisted ...

Comparative study of R134a and R744 driven solar assisted heat pump systems for different applications Baradey, Yehya and Hawlader, Mohammad Nurul Alam and Ismail, Ahmad Faris and Hrairi, Meftah (2016) Comparative study of R134a and R744 driven solar assisted heat pump systems for different applications.

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Natural refrigerants – CO2-based air conditioning system ...

R744 is at least 1,300 times less harmful to the cli-mate than the fluorinated greenhouse gas R134a. Carbon dioxide has a number of advantages as a refrigerant. It has a high cooling capacity, it is non-combustible, and available worldwide at low cost in the required qualities. Innovative plant technology using R744 is ready for serial produc ...

Novel Cascade Refrigeration Cycle for Cold Supply Chain of ...

Turgut and Turgut [19] presented a comparative investigation on performance analysis of cascade refrigeration systems using R744/R717, R744/R134a, and R744/R1234yf refrigerant pairs. Das and Samanta [20] conducted a comparative analysis on energy and exergy of cascade refrigeration system using different pairs of refrigerants.

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All-year vehicle simulation with analysis of capacity ...

shutdown by suction gas interlock are described. Our study of these methods is done by means of a detailed vehicle simulation of a coach. The vehicle model includes an R-134a and an R-744 air conditioning system, which is briefly described. Further on, three climatically different driving route scenarios for the comparative study are introduced.

Thermodynamic Assessment of Using Water as a Refrigerant ...

May 19, 2021· Comparative Study of a Cascade Cycle for Simultaneous Refrigeration and Heating ... Energy Assessment and Environmental Impact Analysis of an R134a/R744 Cascade Refrigeration Plant Upgraded With the Low-GWP Refrigerants R152a, R1234ze(E), Propane (R290) and Propylene (R1270) ... Energy and Exergy Performance Comparative Analysis of Solar Driven ...

A novel type solar assisted heat pump using a low GWP ...

"Comparative study on the performance and exergy efficiency of a solar hybrid heat pump using R22 and R744," Energy, Elsevier, vol. 93(P2), pages 1267-1276. Tieyu Gao & Changwei Liu, 2017. " Off-Design Performances of Subcritical and Supercritical Organic Rankine Cycles in Geothermal Power Systems under an Optimal Control Strategy ," Energies ...

Energy and exergy analyses of a solar-driven ejector ...

Downloadable (with restrictions)! To improve the performance of an air-source heat pump cycle under low ambient temperature, a solar-driven ejector-cascade heat pump cycle which consists of an ejector sub-cycle and a vapor compression sub-cycle is discussed. Energy and exergy models are developed to conduct analyses on the cascade cycle, in which the ejector sub-cycle takes R134a, R1234yf or ...

IIUM: Staff Directory

Comparative study of R134a and R744 driven solar assisted heat pump systems for different applications. In: 3rd International Conference on Mechanical, Automotive and Aerospace Engineering, ICMAAE 2016, 2015: Aerodynamic performance of a naca 23012 half wing model with a reverse delta wing type add-on device .

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